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A frame antenna based on the inverted-F antenna (IFA) structure for the LTE (long term evolution) metal-casing smartphone is presented. The antenna uses a frame section along the short edge of the metal casing as the IFA's radiating strip. There are no gaps required at the two side edges of the smartphone. The frame section is connected to a feed circuit board (FCB) to achieve wider bandwidth. With...
Small-size circuit-defined tablet device antennas for LTE dual-wideband operation are presented. Two cases with dual-feed and single-feed designs are discussed. For the dual-feed design, the antenna is formed by a simple folded metal plate excited by a low-band feed (direct feed with matching network) and a high-band feed (gap-coupled feed with matching network) for LTE operation in the 698∼960 and...
A small-size tablet device antenna formed by a simple folded metal plate excited by a low-band feed (direct feed with matching network) and a high-band feed (gap-coupled feed with matching network) for the LTE/WWAN operation in the 698–960 and 1710–2690 MHz bands is presented. The folded metal plate has a size of 3530 mm and is disposed in a clearance area of 10 ...
Catalytic systems based on activated carbon(AC) modified by manganese oxide were investigated for the hydrolysis of carbonyl sulfide (COS) in a fixed-bed reactor. The catalysts were prepared by immersion method. Effect of preparation conditions on catalytic activity were studied, including calcination temperature, content of active component, drying temperature after immersing alkali and addition...
The influencing factors of simultaneous nitrification and denitrification (SND) was investigated in this study. The experiment was carried out with synthetic wastewater in Sequencing batch reactor (SBR). Some effect factors and mechanism of SND were studied through continuous running of SBR process. Optimum operation condition of SND was obtained in the experiment, and it was found that the removal...
The pretreatment of coking wastewater using ASBR was conducted at 35?? in this paper. The addition of trace elements to the anaerobic reactor has positive effect on the anaerobic treatment of coking wastewater, but too much or too little of it will have negative effect. At the same time the addition of trace elements will be a large cost in field scale anaerobic wastewater treatment. So it is necessary...
In order to enhance performances of organics and nitrogen removal for the treatment of synthetic wastewater containing higher concentration of organic solids, nitrogen and phosphorus than conventional biological phosphorus removal process, a submerged membrane bioreactor was combined with an aerobic granules technology (aerobic granular sludge membrane bioreactor, AGSBR) in this research. The results...
A novel MBR system as aerobic granular sludge membrane bioreactor (AGSBR) developed for controlling membrane fouling was investigated in this study. In the AGSBR system, the aerobic granular sludge had exhibited to be smooth and nearly round in shape. It exhibited good performance on biodegradation and phosphorus removal when compared with a conventional activated floe sludge membrane bioreactor (AFMBR),...
A submerged membrane bioreactor (MBR) combined with aerobic granular sludge (AGS) was studied in this research, in order to enhance removal performance containing higher concentration of organic solids, nitrogen and phosphorus than conventional biological phosphorus removal process. Aerobic granular sludge technology offered a possibility of simultaneous COD, nitrogen and phosphate removal in one...
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